Increase priority of raster threads on Android.

content/browser/renderer_host/compositor_impl_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 
 #include "base/android/jni_android.h"
@@ skipping 128 matching lines @@
 int g_surface_id_namespace = 0;
 
 class SingleThreadTaskGraphRunner
     : public cc::TaskGraphRunner,
       public base::DelegateSimpleThread::Delegate {
  public:
   SingleThreadTaskGraphRunner()
       : worker_thread_(
             this,
             "CompositorTileWorker1",
-            base::SimpleThread::Options(base::ThreadPriority::BACKGROUND)) {
+            base::SimpleThread::Options(base::ThreadPriority::UI_BACKGROUND)) {
     worker_thread_.Start();
   }
 
   ~SingleThreadTaskGraphRunner() override {
     Shutdown();
     worker_thread_.Join();
   }
 
  private:
   // Overridden from base::DelegateSimpleThread::Delegate:
@@ skipping 603 matching lines @@
 
 void CompositorImpl::SetNeedsAnimate() {
   needs_animate_ = true;
   if (!host_)
     return;
 
   host_->SetNeedsAnimate();
 }
 
 }  // namespace content